Can anyone help please

hi i got everything started yesterday for the first time at 7am the light came on got it set for 20 hours on 4 off ihave the 300 watt cfl 5 inches away from my seedlings and the lid is off the seeds are in a 1inch rockwool cube in 12/20 x-steram areo ponic propagator even though now its a bit less cos the seedling have shot up nearly 1inch and the roots roots are popping out of the bottom the 1 inch rock wool cube already im just wondering if i should leave the spray on 24/7 in the propagator temp is 78 -83 and humidtiy 32% with fans all on wat do ya think i also put 18ml of rizatonic to 6 litres of water in the propagater and ph'd it to 6 i had the spray on for 1 hour yesterday morning and the rockwool cubes were soaked so i turned the spray off is that good or bad i just put it on for 15 mins this morning and hand fed them a bit tonight whats the crack with 1/4 strenghth and half strength is that just 1/4 strenghth of the recomended dosage on the bottles of nutes.also when lights out comes on at 3-7am in the morning should i turn my intake fan of so it doesnt get cold cos my intake fan is bringing air in straight from outside and i live in the north east of england not the wormest place in the world please can anyone help. im in a grow tent 1.2x2x2m i have a 8 pot bubble ponic system with a 600watt hialide and hps in waiting with a cooltube reflector any help will be huge.

Yea you dont want to keep the rockwool too wet, just wet enough, but it kinda sounds like you're in a aeroponics cloner/propagator? I would say if your plants look healthy and the roots are kickin keep doing what ur doin.
Day time temps should be 70-80, night should be 60-70, a ten degree day/night diff is ideal. I would hook up your fan to a Humidistat/thermostat. It will kick on when your temps and/or humidity are out of the rang you set, and you can set up day and night temps separatly.